Modelling strength and ductility of ultrafine grained BCC and FCC alloys using irreversible thermodynamics

被引：79
作者：
Huang, M. [1 ]
Rivera-Diaz-del-Castillo, P. E. J. [1 ]
Bouaziz, O. [2 ]
van der Zwaag, S. [1 ]
机构：
[1] Delft Univ Technol, Fac Aerosp Engn, NL-2629 HS Delft, Netherlands
[2] ArcelorMittal Res, F-57283 Maizieres Les Metz, France
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2009年 / 25卷 / 07期
关键词：
Thermodynamics; Ductility; Strength; Ultrafine grained alloys; Work hardening modelling; LOW-CARBON STEEL; C-MN STEEL; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; NONEQUILIBRIUM THERMODYNAMICS; TENSILE PROPERTIES; WARM DEFORMATION; IF STEEL; METALS; MICROSTRUCTURE;
D O I：
10.1179/174328408X353750
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A novel grain size dependent strain hardening model is derived from the theory of irreversible thermodynamics. The model yields the evolution of the dislocation densities in the grain interior and at the grain boundary, as well as their contributions to the flow stress. It is found that submicron grain sizes have a lower dislocation density in the grain interior, causing ductility to decrease greatly. The predicted stress-strain curve shapes, uniform elongation and ultimate tensile strength values for interstitial free steels (body centred cubic) and aluminium alloys (AA1100, face centred cubic) show good agreement with experimental observations.
引用
收藏
页码：833 / 839
页数：7
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